/* Just enough of CodeMirror to run runMode under node.js */

function splitLines(string) {
    return string.split(/\r?\n|\r/);
};

function StringStream(string) {
    this.pos = this.start = 0;
    this.string = string;
}
StringStream.prototype = {
    eol: function () {
        return this.pos >= this.string.length;
    },
    sol: function () {
        return this.pos == 0;
    },
    peek: function () {
        return this.string.charAt(this.pos) || null;
    },
    next: function () {
        if (this.pos < this.string.length)
            return this.string.charAt(this.pos++);
    },
    eat: function (match) {
        var ch = this.string.charAt(this.pos);
        if (typeof match == "string") var ok = ch == match;
        else var ok = ch && (match.test ? match.test(ch) : match(ch));
        if (ok) {
            ++this.pos;
            return ch;
        }
    },
    eatWhile: function (match) {
        var start = this.pos;
        while (this.eat(match)) {
        }
        return this.pos > start;
    },
    eatSpace: function () {
        var start = this.pos;
        while (/[\s\u00a0]/.test(this.string.charAt(this.pos))) ++this.pos;
        return this.pos > start;
    },
    skipToEnd: function () {
        this.pos = this.string.length;
    },
    skipTo: function (ch) {
        var found = this.string.indexOf(ch, this.pos);
        if (found > -1) {
            this.pos = found;
            return true;
        }
    },
    backUp: function (n) {
        this.pos -= n;
    },
    column: function () {
        return this.start;
    },
    indentation: function () {
        return 0;
    },
    match: function (pattern, consume, caseInsensitive) {
        if (typeof pattern == "string") {
            function cased(str) {
                return caseInsensitive ? str.toLowerCase() : str;
            }

            if (cased(this.string).indexOf(cased(pattern), this.pos) == this.pos) {
                if (consume !== false) this.pos += pattern.length;
                return true;
            }
        }
        else {
            var match = this.string.slice(this.pos).match(pattern);
            if (match && consume !== false) this.pos += match[0].length;
            return match;
        }
    },
    current: function () {
        return this.string.slice(this.start, this.pos);
    }
};
exports.StringStream = StringStream;

exports.startState = function (mode, a1, a2) {
    return mode.startState ? mode.startState(a1, a2) : true;
};

var modes = exports.modes = {}, mimeModes = exports.mimeModes = {};
exports.defineMode = function (name, mode) {
    modes[name] = mode;
};
exports.defineMIME = function (mime, spec) {
    mimeModes[mime] = spec;
};
exports.getMode = function (options, spec) {
    if (typeof spec == "string" && mimeModes.hasOwnProperty(spec))
        spec = mimeModes[spec];
    if (typeof spec == "string")
        var mname = spec, config = {};
    else if (spec != null)
        var mname = spec.name, config = spec;
    var mfactory = modes[mname];
    if (!mfactory) throw new Error("Unknown mode: " + spec);
    return mfactory(options, config || {});
};

exports.runMode = function (string, modespec, callback) {
    var mode = exports.getMode({indentUnit: 2}, modespec);
    var lines = splitLines(string), state = exports.startState(mode);
    for (var i = 0, e = lines.length; i < e; ++i) {
        if (i) callback("\n");
        var stream = new exports.StringStream(lines[i]);
        while (!stream.eol()) {
            var style = mode.token(stream, state);
            callback(stream.current(), style, i, stream.start);
            stream.start = stream.pos;
        }
    }
};
